Home / 81,788.16-122,676.32-21,812

Finding the Fourth Proportional to 81,788.16, 122,676.32 and 21,812

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Solution

The fourth proportional to 81,788.16, 122,676.32 and 21,812 is: 32,716.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,788.16 : 122,676.32 = 21,812 : x
  2. Step 2: Convert to fraction form
    81,788.16/122,676.32 = 21,812/x
  3. Step 3: Cross multiply
    81,788.16x = 122,676.32 × 21,812
  4. Step 4: Simplify right side
    81,788.16x = 2,675,815,891.84
  5. Step 5: Solve for x
    x = 2,675,815,891.84/81,788.16
  6. Step 6: Final answer
    x = 32,716.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.